package com.itheima;

public class TestLambda {
    public static void main(String[] args) {
        testD();
    }
    public static void testD(){
        D d1= new D() {
            @Override
            public int max(int a, int b) {
                return Math.max(a, b);
            }
        };
        D d2=(a,b)-> a>b ? a:b;
        D d3 = Math::max;
        int max= d3.max(1,2);
        System.out.println(max);
    }
    public static void testC(){
        //1.创建C接口的匿名内部类对象
        C c1 = new C() {
            @Override
            public String show(String name) {
                return "name = "+name;
            }
        };
        //2.创建C接口的Lambda表达式对象
        C c2 = name -> "name = "+name;
        //3.创建C接口的方法引用对象
        C c3 = TestLambda::show4;
        String result=c3.show("小明");
        System.out.println(result);
    }
    public  static String show4(String name){
        return "name ="+name;
    }
    public static void testB(){
        //1.创建b接口的匿名内部类对象
        B b1 = new B() {
            @Override
            public void show(String name) {
                System.out.println(name);
            }
        };
        //创建B接口的Lambda表达式对象
        B b2=name -> System.out.println(name);
        //创建B接口的方法引用对象
        B b3= System.out::println;
        b3.show("李明");

    }

    public static void testA(){
        //1.创建一个接口A的匿名内部类
        A a1 = new A() {
            @Override
            public void show(String name, int age) {
                System.out.println(name + "," + age);
            }
        };
        //2.将匿名内部类替换成lambda表达式
        A a2 = (name, age) -> System.out.println(name + "," + age);
        a2.show("张三", 18);
        //3.使用方法引用替换Lambda表达式(静态方法)
        A a3 = TestLambda::show2;
        a3.show("李四", 20);
        //4.使用方法引用替换Lambda表达式(成员方法)
        TestLambda testLambda = new TestLambda();
        A a4 =testLambda::show3;
        a4.show("王五", 35);

    }

    //定义一个成员方法，故意让返回值和形参接口中方法一致
    public static void show2(String name, int age){
        System.out.println("show2:"+name + "," + age);
    }
    public void show3(String name, int age){
        System.out.println("show2:"+name + "," + age);
    }

}

